VulnerabilityPublished 15 Sep 2026Updated 13 Oct 2026

CVE-2026-85234: Red Hat Enterprise Linux 10 · Out-of-bounds Read

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 7.5 High.

Data as of 30 Oct 2026, 20:25 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red Hat Enterprise Linux 10tftp	Affected–	Fixed in–
Red Hat Enterprise Linux 8tftp	Affected–	Fixed in–
Red Hat Enterprise Linux 9tftp	Affected–	Fixed in–
Red Hat Enterprise Linux 6tftp	Affected–	Fixed in–
Red Hat Enterprise Linux 7tftp	Affected–	Fixed in–
Red Hat Hardened Imageserlang27	Affected–	Fixed in–

AI-suggested

Red Hat has released official security updates addressing this vulnerability for Red Hat Enterprise Linux 8. Users should apply the updated tftp packages as described in Red Hat advisory RHSA-2026:78952 and the referenced article https://access.redhat.com/articles/11258. For Red Hat Enterprise Linux 10, patch status is not explicitly confirmed in the provided data; users should consult the vendor advisory for current remediation guidance. No other mitigations or workarounds are specified.

Description

CVE-2026-85234 is a vulnerability in the tftp-hpa component of Red Hat Enterprise Linux 10. It involves an out-of-bounds read/write in the in.tftpd remap engine when processing certain inverse remap rules with custom error messages. A remote unauthenticated attacker can exploit this flaw by sending a crafted request to cause the daemon to crash, resulting in a denial of service. Red Hat has issued a security advisory with a patch to address this issue for Red Hat Enterprise Linux 8, but no explicit patch information is provided for version 10 in the input data.

Impact

A remote unauthenticated attacker can cause a denial of service by crashing the tftp daemon through specially crafted requests exploiting the out-of-bounds read/write flaw. There is no impact on confidentiality or integrity reported. The service disruption could affect systems relying on tftp for diskless workstation booting or file transfers.

Summary

The vulnerability exists in the tftp-hpa package's in.tftpd remap engine. When an inverse remap rule that aborts with a non-empty custom error message is processed, invalid match offsets may be passed to the genmatchstring() function, causing out-of-bounds read/write operations. This can be triggered remotely without authentication, leading to a denial of service by crashing the tftp daemon. The CVSS v3.1 score is 7.5 (High severity) with vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Red Hat has released a security advisory and patches for Red Hat Enterprise Linux 8 to fix this issue. The advisory references updated tftp packages that mitigate the vulnerability.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Oct 2026, 22:29 UTC

Technical details

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